# std::error_code::error_code

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< cpp‎ | error‎ | error code

error_code() noexcept; | (1) | (since C++11)
error_code( int ec, const error_category& ecat ) noexcept; | (2) | (since C++11)
template< class ErrorCodeEnum > error_code( ErrorCodeEnum e ) noexcept; | (3) | (since C++11)
error_code( const error_code& other ) = default; | (4) | (since C++11) (implicitly declared)
error_code( error_code&& other ) = default; | (5) | (since C++11) (implicitly declared)

Constructs new error code.

1) Constructs error code with default value. Equivalent to error_code(0, std::system_category()).
2) Constructs error code with ec as the platform-dependent error code and ecat as the corresponding error category.
3) Constructs error code from an error code enum e. Equivalent to make_error_code(e), where `make_error_code` is only found by argument-dependent lookup. This overload participates in overload resolution only if std::is_error_code_enum<ErrorCodeEnum>::value is true.
4,5) Implicitly defined copy constructor and move constructor. Initializes the error code with the contents of the other.

### Parameters

other | - | another error code to initialize with
ec | - | platform dependent error code to construct with
ecat | - | error category corresponding to ec
e | - | error code enum to construct with

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 3629 | C++11 | only `std::make_error_code` overloads were used | ADL-found overloads are used

### See also

make_error_code(std::errc) (C++11) | creates error code value for `errc` enum e (function)
make_error_code(std::io_errc) (C++11) | constructs an iostream error code (function)
make_error_code(std::future_errc) (C++11) | constructs a future error code (function)

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